'Saith' in the Bible

Vanity of vanities, saith the Preacher, vanity of vanities! all is vanity.

There is one alone and without a second; also he hath neither son nor brother: yet is there no end of all his labour, neither is his eye satisfied with riches, and he saith not, For whom then am I labouring, and depriving my soul of good? This also is vanity and a grievous occupation.

See this which I have found, saith the Preacher, searching one by one to find out the reason;

Yea also, when he that is a fool walketh by the way, his sense faileth him, and he saith to every one that he is a fool.

Vanity of vanities, saith the Preacher: all is vanity.